1) Cr₂(SO₄)₃ + H₂O₂ + NaOH → Na₂CrO₄ + Na₂SO₄ + H₂O
Cr₂(SO₄)₃ + H₂O₂ + NaOH → Na₂CrO₄ + Na₂SO₄ + H₂O
2) Cr₂O₃ + NaNO₃ + Na₂CO₃ → Na₂CrO₄ + NaNO₂ + CO₂
Cr₂O₃ + NaNO₃ + Na₂CO₃ → Na₂CrO₄ + NaNO₂ + CO₂
3) NaCrO₂ + Br₂ + NaOH → Na₂CrO₄ + NaBr + H₂O
NaCrO₂ + Br₂ + NaOH → Na₂CrO₄ + NaBr + H₂O